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Abstract
2-D ultrasonography has evolved into an excellent technique in prenatal diagnosis
during the past 40 years. The fact remains, however, that 2-D ultrasonography is marked
by a lack of ability to provide more than a 2-D demonstration of a 3-D fetus. Although
many fetal anomalies are detectable by conventional 2-D ultrasound, it is impossible
to demonstrate a defect in the third dimension. 3-D sonography not only offers the
third plane, but it also provides the examiner with different viewing modes: the multiplanar,
the surface and the transparent demonstration of the fetus. The different viewing
modes not only improve the accuracy in detecting fetal malformations, but also serve
to demonstrate the normal anatomy of the unborn more conclusively to the parents.
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© 1999 Published by Elsevier Inc.